Parks, recreational amenities, and public open spaces are generally considered an important part of a healthy community adding to the cultural fabric and quality of life in society and the community. Therefore, the public health, safety and welfare require that as the population of the City increases and changes demographically, more parks and recreational amenities are needed. These amenities provide a more desirable living environment for the residents of new developments, and reduce the demand for comparable amenities developed or acquired at public expense. With respect to such residential subdivision developments property shall be devoted and/or developed for parks, public open spaces, and recreational amenities by, or at the expense of developers. The acquisition and development of such parks, public open spaces, and recreational amenities are necessary to meet the needs of future residents and shall be provided in substantial part by such future residents. Developed open space shall be designed to provide active recreational facilities to serve the residents of the development. Undeveloped open space shall be designed to preserve important site amenities, scenic vistas, and environmentally sensitive areas.